Machine for threading wood-screw blanks



3 Sheets--Sheet 1.

E. NUGENT & D. TILTON. Machine for Threading Wood Screw Blanks.

No. 233,366. Patented Oct. 19,1880.

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3 Sheets--Sheet 2. EL NUGENT & D. TILTON.

Machine for Threading Wood Screw Blanks.

No. 233,366. Patented Oct. 19,1880.

N. PETERS, PNDTO-LITHOGRAPHER, WASHINGTON. o c

3,Sheets--Shee 3. B; NUGENT & D. TILTON.

Machine for Threading Wood Screw Blanks.

No. 233,366. Patented Oct. 19,1880.

,M M {W 9 N. PETERS, PHOTO-LITHDGRAPMER. WASHINGTON. n O.

UNITED STATES PATENT OFFICE.

EDWARD NUGENT AND DAVID TILTON, OF BROOKLYN, NEW YORK,

MACHINE FOR T'HREADING WOOD-SCREW BLANKS.

SPECIFICATION forming part of Letters Patent No. 233,366, dated October 19, 1880.

Application filed September 21, 1878.

To all whom it may concern:

Be it known that we, EDWARD N UGENT and DAVID TILTON, both citizens of the United States, and residents of the city of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Machines for Threading Wood-Screw Blanks, which improvements are fully set forth in the following specification and accompanying drawings, in which Figure 1 is a top view of our improved screw-threading machine. Fig. 2 is a side elevation of the same. Fig. 3 is a cross-section on line as w of Fig. 1. Figs. 4, 5, and 6 are de tails, hereinafter referred to.

The object of our invention is to so construct a machine for cnttin g threads on screw-blanks that the working parts will yield to any irregularities for the purpose of preventing breakage, and to construct a tool-post or cutterholder that may be more easily adjusted than others in use; also, to providea hopper better adapted to the purpose of receiving and distributing screw-blanks, and to adapt a sockethook to receive the blanks from the race and carry them forward, which can be readily taken out and replaced by a different size. These improvements are valuable in any such machine, but particularly desirable in screwthreading machines having two or more cutters, and have been devised in connection with that for which Letters Patent No. 171,037 were issued to said Edward Nugent, December 14, 187 5, being in the nature of an improvement on said machine.

A is the main shaft. A is the cutter-shaft. B is the feeding device which carries the blanks to the cutter. Bis the cutter. O is a sliding bar which gives motion to the feeding device. Said bar has a longitudinal motion, which it takes from the cam O.

A spring, 1), is connected to the frame and to a collar, d, attached to the shaft 0 of the feeding device for-the purpose of rocking the feeding device forward, while allowing it to yield to any irregularities. A pin, D, at-

tached to the bar 0, acts on an arm projecting from said collar cl and forces the feeding device back.

A spring, G, on the side of the feeding device, holds in place a socket, H, hooked inside of it, as shown in Figs. 5 and 6, so as to be readily detached and changed for another adapted to hold a blank of a different size, which receives the blank from the race S and delivers it to the seat E; and another spring, G, holds the blank in place till said seat car ries it against the front jaw, E, which secures it around the neck and holds it against the seat while being threaded. The seat or back rest E is forced forward and held by an incline, F, on the side of the sliding bar 0, and is drawn back, in turn, by a spring, F. The front gripe or jaw, E, is fixed on a lever hinged at one end to the frame, and held at the other by a spring, F, of such tension as to resist the ordinary strain in holding the blank, but yield to such as might otherwise cause damage-as, for instance, when the blank catches on the point of the cutter.

I is the screw-driver, which has both longitudinal and rotary motions. It takes its longitudinal motion from the sliding bar O by means of a connecting-arm, 1, provided with a spring arm, J, its head. turning between the two arms, the groove around said head in which the arm I is received being sufficiently large to allow the screw-driver shaft to move longitudinally against the spring-arm J. The said spring-arm J is made elastic by being hinged at one end to the arm I and attached to it at the other end by the spring J, so that should the blank catch and refuse to turn the screw-driver would force the spring-arm back and the driver-point would slip out of the nick in the head of the blank, and thus prevent damage. The rotary motion of the screwdriver is derived from the main shaft by means of gears J and K.

V is the tool-post which holds the cuttingtool. It is movable on its shaft A, but is secured, by means of the adjusting-screw V, to a collar or part, U, which is fastened to the shaft by a set-screw, U, not disturbed for ordinary adjustment.

The adjusting clamp-screw V passes through a slot in a projection on the side of the collar U, curved concentrically with the shaft to permit proper adjustment. By turning this screw V the tool-post proper, V, is moved on the against a projection on the lower end of the collar U the tool-post may be adjusted curvilinearly, the curved slot moving under the head of the screw V.

A cam, K, in conjunction with the spring L, (seen at the back,) gives motion to a former, L. The spring pulls upward the einl of pivoted lever 11 and forces the formerL against the lower end of a lever, M, which is attached at its upper end to the cutter-shaft. The cam K forces the lever ll and former back against the tension of the spring L.

The lever M is held against the former by a spring, N, which is hooked at one end to a projection on the frontof the shaft A, to which said lever is attached, and is connected at its other end to the frame. Thus the requisite rocking motion is given to the cutter-shaft.

The spring 1. acts against the lever ll of former L, which former L acts against the lever M, causing the latter to force the cutterpoint against the blank, so that, should the point of the cutter catch by cutting too deep, or from other causes, the yielding of the said spring will permit it to free itself.

A cam,M, acts against the end ofthe cutter shaft and forces it forward longitudinally, cansiug the cutter to traverse the blank the distance required to cut the thread on the same. The spring N draws the shaft back each time. These motions are repeated the number of times necessary to cut the thread to the proper depth.

The cam M derives its motion from the gear 0, which meshes into a gear, 0, on the main shaft.

The cams (1 and K get their motion from a gear, 1, on their own shaft, which meshes into a gear, 1, on the main shaft.

By means of a set-screw, Q, the collar (1 is secured to the shaft 0 of the feeding device. By loosening said set-screw the collar is allowed to turn freely on the shaft 0, and conse quently no motion is imparted to said shaft, while by the yielding ot' the spring I) the other parts are allowed to continue their work. The object of this arrangement is to facilitate the adjustment or repair of any one set of devices without, interfering with the working of the others when two or more blanks are being threaded at the same time on the same machine.

The hopper 1t, into which the blanks are thrown to supply the feeding device, has one side formed of an upright pan, 1:, revolving with shaft S, with its concave side inward, and detached from the stationary body It by a space snfiicicnt to allow the shanks, but not the heads, of the blanks to fall through. The

blanks, thus suspended by their heads, are caught by the spring-pin T, projecting into said space from the edge of the revolving pan R, and are carried to the top of the race S, attached to the hopper-body R, and lcadin g from it to the feeding device B. Sliding down this race, still suspended by their heads, each, in turn, drops into the socket H and is carried forward toward the cutter and deposited in the seat E, which moves forward till the blank is secured by the yielding jaw E, its head toward the screw-driver and on the same axial line therewith. At this time the feeding device recedcs, the screw-driver I advances, its point entering the nick in the head of the blank, and revolves the blank against the cutter B. The former L moves forward, rocking the cutter-shaft, and forces the point of the cutter against the blank, and the cam M forces the eutter'shaft forward longitudinally till the cutter has traversed the blank to its point, when the former L recedes. The spring N rocks and draws back the cutter-shaft. These movements are repeated a sufficient number of times to complete the thread, when the finished screw drops into a receptacle and the operations a re repeated on another blank.

The frame and shaft may be indefinitely extended to accommodate additional sets of feeding, holding, and threading devices, their numher being limited only by the strength of the driving parts. The facility of adjustment renders such additions perfectly practical and advantageous, and any one set of devices may be stopped without interfering with the others.

We are aware that the art of cutting threads on screw-blanks by feeding them from a hopper through a raceway, from which they are taken up and held between dies or jaws and turned by means of a revolving screw-driver entering a nick in their head, while a cutter traverses the blank and cuts the thread thereon, the cutter being governed by a positively-actuated former, is well known and in common use.

Having thus described our invention, what we claim, and desire to secure by Letters Patent, is-

1. The combination of the shaft A, tool-post V, slotted collar-piece U, adjusting-screw V, and screws II and Y, substantially as set forth.

2. The combination of the cam K, lever 11', spring L, and former L with the lever M, shaft A, and tool-post V, substantially as and for the purpose set forth.

3. The combination of the screw-driver I, spring-arm J, bar 0, cams K and U, lever H, spring L, former L, lever M, shaft A, tool-post V, back-rest E, front jaw, E, and spring F, substantially as shown.

4. The combination of the shaft 0, collar d, set-screw Q, and springD with the bar 0, pin 1), and feeding device B, substantially as and for the purpose set forth.

EDWARD N UGENT. DAVID TILTON.

\Vitncsses:

A. HURD, JAMES P. MCLEAN. 

